import java.util.HashMap;
import java.util.Map;

public class BookTest {
    public static void main(String[] args) {

        Map <String,Book>m=new HashMap<>();

        m.put("ISBN-001",new Book("ISBN-001","ios开发到入门到窒息",17.5));
        m.put("ISBN-002",new Book("ISBN-002","python从入门到出家",30));
        m.put("ISBN-003",new Book("ISBN-003","eclipse从安装到卸载",45));

        System.out.println(m.get("ISBN-001"));
    }
}
